meischner



Pmmd Mar. '28, |899.

No. susan;

F. A. MEISGHNE-R. MOUNTING DEVICE F08 SCREW TAPS.

(Application lod June l 1898.)

2 Shasta-Sheet I.

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No. 621,930. ,l

F. A. MEISCHNER. MDUNTING DEVICE FOB SCREW TAPS. (Application leqmne 1,159s.)

(No Model.) l2 Sheeis-Shee't 2.

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FRIEDRICH AUGUST MEISCI-INER, OF CHEMNITZ, GERMANY.

MOUNTING DEVICE FOR SCREW-TAPS.

SPECIFICATION forming part of Letters Patent No. 621,930, dated March28, 1899.

Application filed J une 1,1898. Serial No. 682,313. (No model.)

T a/ZZ whom t may concern: l

Be it known that I, FRIEDRICH AUGUST MEIsOHNER, a 'subject of the Kingof Saxony, residing at 120 -Zschopauerstrasse, Chemnitz, in the Kingdomof Saxony, German Empire, have invented a new and Improved MountingDevice for Screw-Taps, of which the following is an exact specification.

This invention relates to a mounting device for screw-taps which isintended to be used especially in connection with a nut-threadin gmachine.

The object of myinvention is to mount the screw-tap in such a mannerthat the nut to be threaded may be shoved upon the tap at one end of thelatter and leave it at the other end, so that the nut passes over thewhole length of the screw-tap. The latter is stastionary, and there are,consequently, special means provided for rotating the nut and moving itlengthwise over the screw-tap as soon .as it arrives at the threadedportion of the tap. These means belong, however, to the nut-threadingmachine proper and do not form part of the present invention, whereforeI abstain from describing said means. The nut-threading machine which Ihave shown connected with my new and improved` Y similar partsthroughout the different views,

and in Which- Figure l is a side View, partly in section. Fig. 2 is aplan. Fig. 3 shows the nut located upon the threaded portion of thescrew-tap. Fig. 4. is a front view of a slightly-modiiied form ofconstruction, partly in section, the parts in section belonging,however, to the nut-threading machine, as is also the case with Figs. 1and 3; and Fig. 5 is a plan of the form of construction shown in Fig. 4,a part of the large cog-wheel being broken away.

My improved mounting device for screwtaps consists of four bell-cranklevers having each a shorter arm a and a longer arm a. These levers arearranged in pairs, and the arms a' of each pair are connected by a linkb, having a lateral project-ion o.

are fulcrumed upon pivots c, projecting forth from a base-plate t, andthe arrangement of said pairs of levers upon said pivots is such thatone pair-is located above the other, and thev two shorter arms ct ofeach pair move simultaneously in opposite directions whenthe arms ot orthe connecting-link b are or-is moved in one or the other direction. Inthe position shown in Figs. 2 and 5 the lower arms a have left thescrew-tap c, but

the upper arms a (one ofthe upper levers is left away in these Iiguresin order to represent more distinctly the position 'of the respectivelower lever at that time) have grasped the screw-tap between them, sothat the latter remains in proper working position. In order tocontinually secure the screw-tap in this position, it is of coursenecessary that the screw-tap is always held 'by at least one pair of thelever-arms a., and each pair of levers should, therefore, be opened onlyafter the other pair has been closed. To effect such a manner ofoperation of the levers, I prefer to make use of a rotary disk havingtwo projections or pins located upon d-iametrically opposite sides ofthe disk fr, and one pin extends in an upward and the other in adownward direction.

The plane of the disk .oc is located between the planes of the pairs oflevers aforedescribed, and the position of the projections b of theconnecting-links?) of said levers is such that the lower projection maybe actuated by the lower pin oc', whereas the upper projection may beactuated by the upper pin. The

one end of a rod t, the other end of which passes through a hole in therespective pro` jection b.

In the modified form of construction represented in Figs.` 4 and 5 thehelical springs g The. levers The latter are IOO of Fig. 2 are replacedby spiral springs g', which are held by the upper ends of the pivots cand which bear against special pins a2, screwed into the lever-arms a.In all other respects the form of construction shown in Figs. 4 and 5 issimilar to that shown in Figs. 1 and 2. The actually-existingdeviationsrefer only to the nut-threading machine, and are thus described in myUnited States application, Serial No. 632,312, aforementioned.

The nut to be threaded is shoved upon the projecting upper end of thescrew-tap e and is placed upon the closed arms a of the upper pair oflevers. These arms then open and the nut glides down along the screw-tapuntil it is stopped by the lower arms ai. Thereafter the upper armsclose,so as now to grasp the screw-tap, and the lower arms open, so asto let the nut glide farther down along the screwtap until it arrives atthe threaded portion of the same. The nut has then come into the reachof the working parts of the nut-threading machine and is now furtherworked and finished in'and by the same.

Having now described my invention, what I desire to secure by LettersPatent of the United States is- 1. In a mounting device for screw-taps,the combination with at least two pairs of levers arranged one above theother, and being each adapt-ed to grasp the screw-tap between them, oflinks connecting each the two levers of each pair, and means foractuating said links alternately so as to simultaneously open the leversof one pair only after the levers of the other pair have beensimultaneously closed, for the purpose as described.

2. In a mounting device for screw-taps, the combination with at leasttwo pairs of levers arranged one above the other, and being each adaptedto grasp the screw-tap between them, of a rotary disk located in a planebetween said pairs of levers and projections arranged upon said disk soas to open one pair of levers only when the other pair has been closed,for the purpose as described.

3. In a mounting device for screw-taps, the combination with at leasttwo pairs of levers arranged one above the other, and being each adaptedto grasp the screw-tap between them, of links connecting each the twolevers of each pair, projections forming parts of said links, a rotarydisk located in a plane between said pairs of levers and projectionsarranged upon said disk, and adapted to act upon the projections of saidlinks, substantially as dcscribed.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

FRIEDRICH AUGUST M lllSCllNlllt.

Witnesses:

EUGEN NABEL, A. REUCHER.

